35 Ill. Adm. Code 811.204
Final Cover
Section 811
Section 811.204 Final Cover
A minimum of 0.91 meter (three
feet) of soil material that will support vegetation which prevents or minimizes
erosion shall be applied over all disturbed areas. Where no vegetation is
required for the intended postclosure land use, the requirements of Section
811.205(b) will not apply; however, the final surface shall still be designed
to prevent or minimize erosion.